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UNITED STATES PATENT OFFICE.

ALEXANDER OATLIN, OF BURLINGTON, VERMONT; HENRY W. OATLIN, ADMINISTRATORI OF SAID ALEXANDER OATLIN, DECEASED. l

i MACHINE FOR DRILLING STONE.

Specification of Letters Patent No. 9,179, dated August 10, 1852.

To all whom 'it ma/y concern:

Be it known that ALEXANDER CATLrN, late of Burlington, in the county of*Chittenden and State of Vermont, has invented an Improvement on Machinesfor Boring or .Drilling Stone; and I, HENRY W. CATLIN,

of the town, county, and State aforesaid, do hereby declare that I amthe admlnistrator of the estate of the said ALEXANDER CATLIN, deceased,as stated in the certificate of Bradford Rixford, register of the courtof probate in said district of Chlttenden, the same being heretoannexed; and I do further declare that the following 1s a full, clear,and exact description of said lnvention, reference being had to theaccompanying drawings and to the letters of reference marked thereon, inwhich- Figure I represents the top of the frame, the driving pulley, andtwo of the radlal arms, with the cutters. n view of the arms and hollowcylinder. Figs. III, IV and V are front and end views of the chilledcast-iron rolls or cutterfs.k

This machine is intended for boring or drilling stone, by the rotationof a wheel or radial arms, furnished with revolving cutters, which grindor pulverize the stone wlth which they are placed in contact.

A, A, Fig. I, shows the top of a frame, made of heavy timber andfurnished with suitable supports which rest uponA the rails Q, Q. Theserails are kept in advance of the frame, so as to allow it to be movedvforward as the work progresses, and hold the wheel and cutters in closecontact with the stone; Upon the frame A, A, the horlzontal shaft B,isplaced having its bearing i at C and D. At one end of the shaft B thereis a pulley E or a gear to which motion is communicated by a steamengine, or other -motor. At the opposite end of this shaft, E-a hollowcylinder K K4 is attached and firmly secured to the shaft. This cylinderK, K, may be made of wrought or of cast ally to the periphery, wherethey join the circular band', or .rim J by which the arms arestrengthened land'their outer ends held Fig. II,is a frontA in place;any number of concentric rims may be bolted to thel arms, as at S, togive them additional strength. The arms G, G, as seen in the front vieware in the direction of the radii of the circle, while in the directionat right angles with the shaft B they are so curved or bent as to allowthe circular revolving' cutters N, N, that are supported upon them, tobe presented to the stone in different vert-ical planes. Short standardsof iron, M, M, are fastened to the arms, Vand are fitted to receive thecenter pins, or axles, P upon which the cylindrical cutters N, revolve.These standards are so placed as to hold the cutters that are uponopposite arms, at different distances from the axis of rotation; thecutters thus break joints with each other, and are prevented fromforming concentric grooves in the stone.

The cutters or burs are made of chilled 'cast iron; they are from two tofour inches in length, about two inches in diameter, and are placed asnear to each other as the bearings or supports will allow, their numbervarying according to the size of the machine. Upon part of the arms thecutter that is nearest to the center, as at W, is placed in such aposition as toleave the diameter of the circular walls of the cavity H,into which the core enters; the outer cutter, as at X is also placed soas to make the diameter of the hole, or excavation in the stone, greaterthan the diameter of the wheel or arms which carry or support thecutters.

The cutters, Figs. III, IV an'd V are made their center to receive'thepin or axle P.

The exterior or cutting surface of the rolls is to be varied accordingto the nature of the stone that is to be operated upon; they may be utedas in Fig. III, grooved, as in Fig. IV, or grooved spirally as in Fig.V. To use the machine the frame is placed so that it may traverse uponthe rails; 'power is then applied to the gear or pulley, which turns theshaft with its attached hollow cylinder and radial arms; the cut-tersrevolve by friction upon'the stone into which they enter, while thecentral part or core of the stone enters the cavity of the cylinder.When the cutters have entered the stone t`o of chilled cast iron, havinga hole through diameter of the core of stone, less than the .Y

the depth of` a few inches the frame is drawn back and the core isbroken olf with cutters, in the manner and for the purpose hannersorvellges. h herein described.

n ehal o t e wit in named ALEXANDER CATLIN I C1aim I i H. W. CATLIN. [L.et] 5 The revolving arms or wheel, having a Inpresencetof.-

cavity near its center to receive thecore of J No. P. COLBURN,

the stone, in combination with the revolving C. F. DAvEr.

